scholarly journals Investigation of Meshing Strategy on Mechanical Behaviour of Hip Stem Implant Design Using FEA

2020 ◽  
Vol 10 (1) ◽  
pp. 769-775
Author(s):  
◽  
Joko Triyono ◽  
Aditya Rio Prabowo ◽  
Jung Min Sohn
Keyword(s):  
Hip Joint ◽  
Mesh Size ◽  
Vertical Axis ◽  
Numerical Approach ◽  
Implant Design ◽  
Hip Joints ◽  
Central Processing ◽  
Element Size ◽  
Artificial Hip Joints ◽  
Human Joints

AbstractHip joint is an important human joints system. The damaged hip joints need to be replaced with artificial hip joints. The Study of the hip joint is very costly therefore another calculation method is demanded to produce good result in acceptable time and cost. Considering this problem, a series of study to assess hip joint performance is conducted using numerical approach. Important parameter for example applied materials are used in the modelling by idealizing Ti-6Al-4V compared to SS 316 L, and stemlengthwas chosen to be 128 mm. ANSYS software was used to analyze models, and designed element size variations were set to be in range 1 to 2.5 mm. The magnitude of force was placed on the femoral head with an angle of 16∘C from the vertical axis. Results showed that SS 316 L material has smaller deformation than Ti material. Whereas Central Processing (CP) time decreases in increasing element size for both materials. In addition, more variations in mesh size are needed to get more accurate convergent results.

Fatigue Strength of Cobalt-Base Alloys with High Corrosion Resistance for Artificial Hip Joints

1978 ◽  
Vol 7 (4) ◽  
pp. 241-250 ◽  
Author(s):  
M. Lorenz ◽  
M. Semlitsch ◽  
B. Panic ◽  
H. Weber ◽  
H. G. Willert
Keyword(s):  
Fatigue Strength ◽  
Hip Joint ◽  
Cast Alloy ◽  
Fatigue Cracking ◽  
Fatigue Behaviour ◽  
Hip Joints ◽  
Artificial Joints ◽  
Surgical Implants ◽  
Artificial Hip Joints ◽  
Cobalt Base

Loosening of the anchorage in the bone is a problem in hip-joint arthroplasty which up to now has not been entirely solved. In the loosened condition, anchorage stems of artificial joints are subject to alternating overload which causes rupture if the fatigue strength is exceeded by the stress amplitude. At Sulzer a hip-joint anchorage stem made from wrought CoNiCrMo alloy Protasul-10 has been developed which has substantially higher fatigue strength than stems made from stainless steel of grade AISI-316L or CoCrMo cast alloy. It is therefore essentially safe from fatigue cracking and this offers the possibility of significantly easier removal in case of re-operation after loosening. This paper deals with some rules to be observed in choice or development of materials for long-term implants subject to fatigue. The results of laboratory investigations on the fatigue behaviour of cobalt-base alloys for surgical implants are discussed.

Alumina–alumina artificial hip joints. Part II: Characterisation of the wear debris from in vitro hip joint simulations

Biomaterials ◽  
2002 ◽  
Vol 23 (16) ◽  
pp. 3441-3448 ◽  
Author(s):  
J.L. Tipper ◽  
A. Hatton ◽  
J.E. Nevelos ◽  
E. Ingham ◽  
C. Doyle ◽  
...  
Keyword(s):  
Hip Joint ◽  
Wear Debris ◽  
Hip Joints ◽  
Artificial Hip ◽  
Artificial Hip Joints

Comparison of the Bearing Performance of Normal and Artificial Human Joints

1973 ◽  
Vol 95 (3) ◽  
pp. 333-339 ◽  
Author(s):  
P. S. Walker ◽  
B. L. Gold
Keyword(s):  
Hip Joints ◽  
Artificial Joints ◽  
Metal On Metal ◽  
Joint Lubrication ◽  
Artificial Hip ◽  
Normal Human ◽  
Artificial Hip Joints ◽  
Human Joints ◽  
Film Lubrication ◽  
Fluid Film Lubrication

A comparison is made between the lubrication mechanisms believed to occur in normal human hip joints, and artificial hip joints. A review of the literature and some new experimental data is used to highlight many of the characteristics of human joint lubrication. Specimens of artificial joints removed from patients after various periods of service were studied, and deductions made about the modes of lubrication and wear. Both metal-on-metal and metal-on-plastic joints were considered. It was concluded that human joints operated mainly by fluid film lubrication while artificial joints displayed principally boundary lubrication.

Contact Mechanics of Soft Layer Artificial Hip Joints: Part 2: Application to Joint Design

1994 ◽  
Vol 208 (4) ◽  
pp. 206-215 ◽  
Author(s):  
J Q Yao ◽  
T V Parry ◽  
A Unsworth ◽  
J L Cunningham
Keyword(s):  
Shear Stress ◽  
Aspect Ratio ◽  
Coefficient Of Friction ◽  
Hip Joint ◽  
Contact Area ◽  
Hip Joints ◽  
Soft Layer ◽  
Physiological Loading ◽  
Artificial Hip ◽  
Artificial Hip Joints

In this paper, the general solutions previously obtained for the contact mechanics of a soft layer artificial hip joint have been applied to the design of such joints. In particular, simple power-law design formulae have been generated for the prediction of the contact radius and the maximum Tresca shear stress within the elastomeric layer, when the aspect ratio varied from 1 to 20 (which covered the entire range of the aspect ratio for soft layer artificial hip joints). The effects of the layer thickness, Young's modulus of the layer and the equivalent radius of the joint upon the contact area and the maximum Tresca shear stress have all been examined for physiological loading conditions which would be experienced by hip joint prostheses in the body. Furthermore, the shear strain field was calculated so that the level of strain expected for such joints under physiological loading conditions can be estimated. With these data, relevant fatigue tests can be devised to assess the long-term performance of any particular design of soft layer hip joint. Finally, the effect of the friction between articular surfaces upon the stress field within soft layers has been examined using a newly developed asymptotic analytical theory. It was shown that, for a low coefficient of friction, the maximum Tresca shear stress occurred at layer-substrate bonding interface. With an increase in the coefficient of friction, however, the maximum Tresca shear stress increased its magnitude and moved towards the centre of the contact area along the articular surface.

scholarly journals Measurement and evaluation of specific absorption rate and temperature elevation caused by an artificial hip joint during MRI scanning

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Youngseob Seo ◽  
Zhiyue J. Wang
Keyword(s):  
High Temperature ◽  
Hip Joint ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Rf Heating ◽  
Temperature Elevation ◽  
Hip Joints ◽  
Specific Absorption ◽  
Artificial Hip ◽  
Artificial Hip Joints

AbstractA primary safety concern in a magnetic resonance imaging environment is heating of metallic implants by absorbing radiofrequency (RF) energy during MRI scanning. Experimental measurement in conjunction with computational modeling was used to evaluate the risk of biological tissue injury from the RF heating of artificial hip joints by obtaining both specific absorption rate (SAR) and temperature elevation at 1.5 T and 3 T MRI systems. Simulation result showed that high SAR and high temperature appeared near both head and tail sections of the artificial hip joints. For five different 1.5 T and 3 T MRI systems, measured temperature location showed that high temperature rises occurred near both head and tail regions of the metallic hip joints. Measured SAR value of 24.6 W/kg and the high temperature rise (= 4.22 °C) occurred in the tail region of the hip joint at 1.5 T, which was higher than the limits for temperature required by the international electrotechnical commission 60601-2-33. We have demonstrated the feasibility of evaluating RF heating of metallic hip joints during MRI scans.

A reciprocal walking orthosis hip joint for young paediatric patients with a variety of pathological conditions

2001 ◽  
Vol 25 (1) ◽  
pp. 47-52 ◽  
Author(s):  
P. J. Woolam ◽  
B. Lomas ◽  
J. Stallard
Keyword(s):  
Hip Joint ◽  
Sagittal Plane ◽  
Vertical Axis ◽  
Lower Limbs ◽  
Knee Joints ◽  
Hip Joints ◽  
Flexion Extension ◽  
Total Body ◽  
Lateral Rigidity ◽  
Adjustable Range

A growing trend in the use of reciprocal walking orthoses for infant paraplegic patients, and their application for control of the lower limbs in very young total body involved cerebral palsy patients, has created a need for smaller components. A prototype design of a hip joint has been produced which provides the following features: adjustable range of flexion/extension control; override on stops to permit sitting; high lateral rigidity; no lateral bearing play; very high rigidity in the sagittal plane; low friction bearings; high resistance to torque about the vertical axis. In addition a size envelope which is more in keeping with the dimensions of infant patients was an important objective. Comparisons were made of the computed structural properties of the prototype joint and existing routinely available standard orthotic hip joints. In each plane of loading the prototype joint had the highest identified structural property. The hinge-bearing material was tested in a representative joint with 200,000 cycles of typical loading. It was also field tested on adult orthoses over a minimum of a 12-month period with the most vigorous of walkers. In neither test did excessive play develop. The mechanical properties of the joint were established using tests advocated in the British Standard on testing lower limb orthosis knee joints. These showed the joint had structurally equivalent performance to a successful reciprocal walking orthosis hip joint, and that the mode of failure was essentially ductile in nature. Production development of the joint is now being undertaken.

A Simulated Synovial Fluid for Wear Characterization of Artificial Hip Joints by a Hip Joint Simulator

2006 ◽  
Vol 309-311 ◽  
pp. 1273-1276 ◽  
Author(s):  
Hiroaki Takadama ◽  
Mineo Mizuno
Keyword(s):  
Hip Joint ◽  
Bovine Serum ◽  
Calf Serum ◽  
Major Constituent ◽  
Wear Property ◽  
Hip Joints ◽  
Artificial Hip ◽  
Artificial Hip Joints ◽  
Wear Characterization

The calf serum solution was defined as the international standard lubricant for wear characterization of artificial hip joints. It is, however, known that its composition varies according to age, manufacturing processes or production areas of bovine cattle, and that the difference in composition has large effect on the wear characterization. It was difficult to compare the results obtained by different laboratories. Therefore, it is desirable to develop an artificial lubricant whose composition can be always set to a specified value as an alternative to bovine serum. In the present study, the effect of each major constituent in bovine serum on wear property was studied by hip simulator. As a result, transparent and stable lubricant solutions were prepared. It showed quite similar wear property to bovine serum by controlling the composition. These results serve as a guide to propose the new lubricant suitable for the wear characterization of hip joint.

Elasto-Hydrodynamic Lubrication Modelling of Spherical Metal-on-Metal Artificial Hip Joints

2005 ◽  
Author(s):  
F. C. Wang ◽  
Z. M. Jin ◽  
I. J. Udofia
Keyword(s):  
Hip Joint ◽  
Hydrodynamic Lubrication ◽  
Hip Joints ◽  
Hip Implant ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Joint Implants ◽  
Artificial Hip Joints

A full numerical methodology was developed for the elasto-hydrodynamic lubrication analysis of hip joint implants for the lubrication problem in spherical and conformal contacts. Typical results of a metal-on-metal hip implant were obtained to illustrate the applicability of the numerical methodology developed in the present study.

Metal-On-Metal Articulation for Artificial Hip Joints: Laboratory Study and Clinical Results

1996 ◽  
Vol 210 (3) ◽  
pp. 223-232 ◽  
Author(s):  
R M Streicher ◽  
M Semlitsch ◽  
R Schön ◽  
H Weber ◽  
C Rieker
Keyword(s):  
Hip Joint ◽  
Laboratory Data ◽  
Clinical Results ◽  
Hip Joints ◽  
Wear Rates ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Artificial Joint Replacement ◽  
Artificial Hip Joints ◽  
Screening Device

As wear is inevitable with artificial joint replacement, it has to be minimized to avoid possible aseptic loosening following osteolysis due to particle-initiated foreign body reaction. Co-Cr-Mo-C alloys have a long history with only minimum wear when articulating with themselves. This investigation shows that the choice of the alloy has an effect on the wear rate of this articulation couple. Tribological studies in a screening device, a pendulum apparatus and a hip joint simulator showed a marked influence of the environment as well as the diameter of the implants with metal-on-metal articulation. A wear-resistant combination with low friction characteristics has been developed by using a wrought Co-Cr-Mo-C alloy and reducing the implant diameter to 28 mm. Clinical wear rates are comparable with laboratory data and demonstrate the potential of the metal-on-metal articulation to solve the problem of wear-induced osteolysis of hip joint endoprostheses.

Sign in / Sign up

Export Citation Format

Share Document